rename to SPF_recalloc by hannahs suggestion
rename to SPF_recalloc by hannahs suggestion

shevek/libspf2,shevek/libspf2,rubicks/libspf2,rubicks/libspf2,rubicks/libspf2,rubicks/libspf2,rubicks/libspf2,shevek/libspf2,shevek/libspf2,shevek/libspf2